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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b235368b1deaa2cdc0a95a199ee2022eb0e37e34e61235e663850a88bd54f9cb' 
  AND token = 'Yz5YspBSEWIQjKSnSfC6m2S0fNYe0acMyG3n1B43b7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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