Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a44051b4868d14ed0036a4393f73cea6c8082ecffbb2cfef5fa09aad856271' 
  AND token = 'WHKMaqs9chF+evHk4V5d2D+mqMS8ExeRWb5SjY8oMjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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