Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40c8063ff88c9f2d8cf3b18712f3a5b8c526a13a10a815f2a72423a3f26a2e6' 
  AND token = 'lE6hnHOxWmQbD4k0OxT7jpHe5HH7fVeIZOnlq3IhSro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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