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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7ffd7219e90000b46a567f389c3ce64a036c94f91c16307b80c11dd8aa78bcb' 
  AND token = 'Lyi2r1JsaYSbkQBv4/04BQ3AJh5c8Zhr6CLMoqqQtcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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