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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '863831a15af37f2c3026b1817e427502a6a0b5f85bfbaf4d28ef1d18cf322754' 
  AND token = 'zvOK0ENn8md8xGqUV3/kOJdnjgFa7LeTE50Fb+nHjgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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