Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7845437e1686e8a063bbfc29cfd78f92d87e93ccaff5e4e3bc079d6c3c2cd671' 
  AND token = 'B9o8GpckNEpnz+sjFz2nbvhaXhaFZWU1DammXwcAXG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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