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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4810b64d2ad079f6c731de6b7476e5979f9f4068e45ac7482ccf3bde546e8080' 
  AND token = '4IdaP7DdHMI4kucZl0Jc0n2GdJ7bTzvEvMB23KA6vLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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