Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b37e7700d32e5f9ee737a5d3397bddd5ad10a7b35f4589678ab8d966ab943528' 
  AND token = 'jBd74dfCv6X2v8a/inQUSuyOnefUK2Yxpq1TeR8i29w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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