Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd8e8c76f00388598ebc7892b2bb679a46bae3f3a823efe2c4d6502b6441a4c' 
  AND token = 'EQ4EokFcPUNkVqCTt20/8y2jPOKyOIbB3F1xDJV5qZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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