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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'febd8e055f18d4a8978e73546b0cc127f6897fce80a3141a0851ae8db69612c7' 
  AND token = 'bypTjecTOL2NzD1OjTlcWnVY+7W02xhE3fxK38Btd7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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