Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe555763891af5456415568eccd889903d8ece82fa3cc918ac96a1d77070f636' 
  AND token = '/9zR4a5kAz/hL5pEaiPZnyLu1+1q4MTNhh+8t/yGCNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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