Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d08190e93e0f7b0e10bf0d27e5b7f3dee55c4a1320b65e195ff0f1e48d7a5e' 
  AND token = 'aBKRrSNiwUbjlhntDFBXFKmEcfJVUQ6EUSNjd5I+Ssc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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