Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59390f736c92c6e8c3dfce343bc2ca842d0b520e1ed2fdff3e63b9fb05c89108' 
  AND token = 'UV3FMPi1n+ifjS4btF/4lBw8nUhcy4/w3NIi1yY3K6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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