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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ca6d10a83ba297637957f068aa07152227dd7c3ef97b0c3843f2dc895490b1c' 
  AND token = 'Hxs5DBL6SQ5nb+wqnwoR0ZiB+HBQ06f8NF7n18sjubc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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