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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '50bf9921c26d6f870a20c5f99e39bf2db78026c368b4adb00284c093ceef349c' 
  AND token = 'Ze8pXqXJGhzGil/fW9DOQ4oSSA8U0sEhWbjeNmXHNs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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