Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb938e3fc00d32586c07574ed2a5b8a556bafd2dd0eb7dad84c12ff30d5dbd1a' 
  AND token = 'e0gW3HW5bHyPbhzYAbEulpi64p5CV37llqTeqIgkl7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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