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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab8767f88e97893e3f74cad8e2698e786defae40a108c674830e0d6d6e816f7e' 
  AND token = '63yF2BAjr3HON/AzvBJy7LtsrOPbr2o+PnCGlLo9gKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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