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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '76803505d45046f34717b081c263a5377808f547609742d86354c7733fb2af14' 
  AND token = 'DOR/srTJ04JNxZrCh77p2eFkcTNpZ5SdAy8VMPwd9gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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