Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238802c0cfb4c21c8c5459bb2436cd8459c32b69a1e44a652aac39161393ca1b' 
  AND token = 'z68tK68hMLvvVZKyNXN0T/VT3s3VDqcyfrlnmf6egNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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