SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39f5715a4569682c69c621b36130d5c8ca792206e2836f11341820cf12cfdd82' 
  AND token = 'FVb0gSw2dfl/rPvtxjQoJB2Wpr/W7abWD4PP3/zUNqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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