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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6776c54c681757c878e25ba633761773369d2fdf43252a7b61cb1baed0df3f59' 
  AND token = 'A5anf5o6GtUgM6L/7WR+10rHLFpYzTehdR6ZxY4zzOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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