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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7804a79cf3982038b9d9f588057cd4aa7817c41b13d72718916c70dc0fdf19d0' 
  AND token = 'dFY9ncPezzTDf8SH6zo74xRISKQtiW1ldfe8WLaUe2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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