Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd72891e421540dca07326d7159e8ab36adccc734c1867e1d4516a9595986c53' 
  AND token = 'SmmTfliCY+x/fgzOg06zdgDntjjDaiHc3kM/bUWNEaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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