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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b84388ac36dae6702d5bfc109564c1c8dca623bce8579daabce3d11c07f56a0' 
  AND token = 'b0417sdhwkPt/hcjH4Pln6Y2wUNk2828d8S+y5NoOa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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