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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '591355c57177ca4e6f1c118c21f453d4cf8050129f31dc1c6360f3f45cfafb10' 
  AND token = 'pGPghNzmGxr3fKrqG51QrQ2xlZWRfzRh9ggvxDxyEac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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