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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89c5bee89de534531b0aaed368eefce089daac2b7108af1a5990db48fa7e2de3' 
  AND token = 'RVjtwBfOHQprGc4Yh8EGqFpTZ+IiPWDfoBRh5tRVR1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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