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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6825d73ea5a2d6665a235f4b006e58d0daab0340c87c1d5731fc31bef6b1b61c' 
  AND token = 'jpFpDJ1Jq56VjcIdRgEj0cdagTnDgsgidQ4i6u6wPUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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