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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '208fe61e53d912e9a153716422e6fa6bc5029e0d69532e88741aabacadb873d0' 
  AND token = 'nA7ibJ02NkRqWoUN80aAlcFQFUHe56+fW8UKs99N45U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}