Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78509695fb06792db3d87ce62370d4caf02206e6c229dbfd4cad7e53ac92dfaa' 
  AND token = 'zcVu4i/IGvw85048vBQdvypj/VF5ZVBmELWSm7wEPJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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