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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd16bd27d529827e41f0bc6a634bb10dad1d221a74b2e648e9d222eb6edf38877' 
  AND token = 'noq4fhil/P2bGhn/Io4gNkN1F0yQEJ/CggfCr6vXx4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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