Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c91794c6a6196919d02d3dac3eba48228065f4621dffa1da634e6ee8666ee59' 
  AND token = 'lInTpHeuGMRI7mm+AbHeihZyAv4PvxlX0EXdhIWWRk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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