Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfc0c6c2e8b05df13b3cfc53721f3352c634993162a459fd7d86b3fe8e61903' 
  AND token = 'UenHKWrUb+y3pB0X+rWhTqEIZKN34kO7lxRQH0pPTlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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