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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31c85985aa3976ed98eace2627d2803024b8134b6cae808393b1eb242ae39615' 
  AND token = '87rxJ2wS3oiFy0i11rI5zx2YRZbwyn4dKuUm7lE8wvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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