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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ea6e4712ca672e5bd8d0a7cee7afdc421e3f059b4837f3270d77b36a561ee1b' 
  AND token = 'xARwPMQYz/Mi0SSiDu+NhsfddFk0F4GyzrTQsC7HcDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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