Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9187e5bee68a58a1a6b7b768ee8e636730aa84c8e916c1b2233ec354d9d1ff' 
  AND token = 'x3pfFF9x7TVrOnfG6Tk9o+o9TOYyWgzxnlDVltK8OP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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