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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19c105a42457df3be55ed1c37ff5cadcd56fa45f6e0ee7f38351f3ceda4b8bb7' 
  AND token = 'Iv8/afVBpTsCfS51rV6DlLM5OwjyqQ8CTM6Y4TrTLEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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