Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33527aa1eca830c8f9c833e3e308c6bdb0e128203730a93c75d6db355c531796' 
  AND token = 'n0F/sEy7o4S5kda7Xqb63eOuX0nrQUKs/pGeTeDhB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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