Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cfd800ea86cae8789b7361e5af510656968e3c8e17df59910301c333302e7b' 
  AND token = '9igtCtKiSKFJucQ1SsqszWR5BqcYkJikz876SgoDHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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