Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd322feca5f8b7d01ff9fc051927912cde5b9edcbdf04f9f00019bc2b246b9300' 
  AND token = 'RSL8qefyXEjolbyjK4mvmvilcnqBvZB4uYCfEocJ5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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