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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5ad15f53703927ea7e765c3a99e836a8572a3bd7c848bbbc3e57e0645bae6628' 
  AND token = '2iY8m4Aaik54HurdKD/ncUlPuSt1cTPHFAwdwitpEuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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