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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e45021bd8a3670e84129c97a9fe9a793ac704f81c40fb9d3eade2ed77732db99' 
  AND token = 'WLDHGv0il2GztTx4MXO672Vg8jKZ2CFtQl1Rq3FcgC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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