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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1532f5625f04eef3f4233e7e7d5107e60fa95c9c93401fae47359b3211a506dd' 
  AND token = 'x2qmHzihkrPhPI9FAYKhGmJC0hyO39JUMf8cwK1DEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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