Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3cf01a627786573450e4f0bbe4b96dd830916e8c11db4c283f3d3f4639a7cb' 
  AND token = 'TZF1CDQAAF3rVYbnDi8WysJuCZh8ua6NPMxS/hhLt34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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