Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6a2c084aa33f18d61f23f58e242a1ba952a1ede004f704da3f921390d35504' 
  AND token = 'aLwP6B7cEG3PZ2v7f+Ej6MHMV9FDIubZCAn8Px3YY3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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