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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9a179c37005abc903a5971ebfe14e3a8ad9633078547c2f6d98a39ba8f610c7' 
  AND token = '6rRhRe5mwrX76w39CoXg1qkZnoW1sKgTc7VeeWknul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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