Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aac43aa91a3c2486879b5e88e0c1ce71ab56ba733b0f03ebb299faa847c2039' 
  AND token = 'ljJ3amOyw55W8AhcxRd1DwrxTqDULX3DuI4NK22QOYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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