Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54beec2da8683001c49375479b971591e674ef0564ac5c0b97e479c850ad2f4' 
  AND token = 'K/2RxFTuMFRRo0gYVWQyhpfATT+amEI6mg0KfjZXuD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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