Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf5e1c866e29bd8c2aabdb8f19f0919d94091217b43853c2dfd9c2d88c93e80' 
  AND token = 'xpQ9aDQZ89ejaMUQbOh9YCFZDoQURGU8w21irPz3ZQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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