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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '97376c5ecb7fe7172a13c67985227afabcc642b907bc55531c332f49e1dce4a3' 
  AND token = '3ZWGnXibqidWH3pLOefAyDOnxjPjIuB+Qo8orqicBXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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