Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a9dc52c8d100aa99195ca26117c2eb6182ab750f3cb82829734f7a1fab389b' 
  AND token = 'cTXxj6k3Y2NKFfDsTEWhf8JqDidzODP2gJ1JUZKXQVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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