Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe634746aa7bcd5db4ca800a09bee02243c68cc472d1c6ff242b3e60643ffc83' 
  AND token = '0GwGfum+i3FB1RBiu46YyUjmpHX8145MpoDrnaH/vxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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