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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34afd0c0caa4b8ee393df1d843eeec7acafe7b28561ecdde14e3284862974389' 
  AND token = 'uUXVGiOpkhLa/TSE6PDw6uzlrOWSjADPyXFyM6hBeIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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