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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d557de57a151380acf4bf7dbe2b4c655d999356ff312ff3f45e1227c8d6ec11' 
  AND token = 'bQREf7RmRdq53tjSXXhLCOioIkpwF2P/aR5c86yCgH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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