Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6a45d55f78edf02ab1394195d2b890ffbbda9a75a82e3180170c3fcc7639f9' 
  AND token = 'JDYwetRXbHKhQaO7LHHNJUsR3FHkNxPifMc095KDkT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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