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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1276f54720889359d950aee19a2bd47fd98c76690d8a99c81a342c0838efc1a8' 
  AND token = '/ac6UAh7gS7sf9vIIBo6pzGne1yg5w3L//A0v5vwyCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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