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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93f7dd33628c814a670858ca36b130c99cb65589b3ae3d3999380b112ac1eee1' 
  AND token = 'X++glKNnAGMtmoZMK+nkQtF8PtLEuvpPxXts69zsI40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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