Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c859d3fe7126aedf704d22ac0a3fbc2704987c67c9f8f134dabac3502fab149c' 
  AND token = '6zjjOmiXW3ttj95n3n0U5LEzNm1XuMWjkCcVO6pPzwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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