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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '83f981c052eb9bae6312f757ad7889ab32f510a19ad05ab28b4bd657a5add2b4' 
  AND token = 'nHkgMckKD4UBVuYlm9B71kqpWh9f2uRd/k7L621oHcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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