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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '771526b07494f8d5495665bc5b5e5c943674fe4d09e161cbf7d3fb926d766381' 
  AND token = 'ogo3HwSCkjJU6lijZBRItPi2TtaRbLriCt3sPJnDyGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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