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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f1f50c6d1fb988c0db658ef7c23c4a921992e8de336308fa7669192de78fcc1' 
  AND token = 'dDvwXeBfL4k66wVeikbgbh8RoteEvVcfACc552Lg3mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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