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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91364e7dd03555bce7f2d2d52d22ba3b504d8646c9630fdc57bb88e8f56fb03d' 
  AND token = 'mCKxbrAJNbGB2r92tKFBU/PCxI2EDWrOGQ7h+bKB4YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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