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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '149dd7e87b78ee0b9c1dab051c69e9b93cc8f902a8b637f13e18b85b03fff601' 
  AND token = 'hvpX2ANT5HhE/82hmba2GUrr9faK1OGoTFMzvWEI8TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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